SPC AC 270704

   Day 3 Convective Outlook  
   NWS Storm Prediction Center Norman OK
   0204 AM CDT Wed Sep 27 2017

   Valid 291200Z - 301200Z

   ...NO SEVERE THUNDERSTORM AREAS FORECAST...

   ...SUMMARY...
   Severe weather is not expected across the U.S. Thursday.

   ...Synopsis...
   Confined to the northern half of the U.S. and Canada, a progressive
   northern-stream upper flow field is expected Day 3, with a trough in
   the east, a ridge over the Prairies and north-central U.S., and a
   second trough moving into the west.  Farther south across the U.S.,
   a weakening trough over the Intermountain West will continue
   drifting slowly northward, with flat ridging persisting over
   south-central portions of the country.

   At the surface, high pressure will prevail over much of the country,
   though a cold front is forecast to move into/across the northwest
   portions of the U.S. ahead of the aforementioned western North
   America upper trough.

   Showers and possibly occasional/embedded lightning will be possible
   over the Pacific Northwest vicinity in conjunction with the
   advancing storm system.  Showers and a few storms will also be
   possible over portions of the Rockies and adjacent High Plains, and
   also from Texas eastward to the southeast near/north of the
   old/remnant surface front.  Finally, showers and a few lightning
   strikes may occur over the Great Lakes vicinity as troughing aloft
   crosses this region.  In all locales, severe weather is not
   expected.

   ..Goss.. 09/27/2017

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   NOTE: THE NEXT DAY 3 OUTLOOK IS SCHEDULED BY 0730Z